Valve-gear connection in internal-combustion engines



March 30 1926 a F. MADLER ,540

VALVE GEAR CONNECTION IN INTERNAL COMBUSTIO ENGINES Filed April 6, 1921l// I Ill/l rveniar) M Jbu W f engihes. Its particular obj'ectis torelieve Patented Mar. 30, 1926.,

FRANZ LOUIS MiDFER, or nnnLrlv-cnnnnoriinlvnime; eam/ AME; ns'siiriw'oitTo MAEDLER nne-mseenroiiarron, aconronerr'onsor MARYLAND.

vALvE-GEARoomInorIoN IN urnnnnr-co-msusrioauENGINE I ApplicationfiledIApril 6,

i921. seria'i'i o. 459,191.

GRANTED om ts 'rnn' riwi reious or" runner er amnesia, 1921, 41 scram.,1'3"13.

To all whom, it may concern:

Be it known that I, FRANZ Lorre Mlinnnn, a citizen of the German Empire,residing at Berlin-Charlottenburg, Germany, have in- 5 fvented certainnew and usefulImp'ro'veinents Qin Valve-Gear Connections inInternal-Cyn- 'bust'ion Engines (for which patent applications'havebeenfiled on thefolloivi'ng dates in the following countries foreign to theUnited States, Germany, April 8, 1918; Austria, June 9, 1920"; Hung ry,July 9, 1920 Czechoslovakia, June 17, 1920 -;Pola'n'd, 511M128, 19-20;Eng1and, July 3, 1920; Canada, July 10, 1920 Sivitzerland, June 12,1920; France, July 1O, 1920), of Which the following is a specification.I,

'My invention refers to internalcombustion engines and more especiallyto the arrange ment of the valve gear connected with such the cylindersof such engines almost entirely of all detrimental additional stressessuch as'might be caused by valve gear. 2 In the design of airplaneengines it is essential, in view of the light, construction used,particularly in cylinders and ,Water jackets, to relieve the cylindersof detrimental strains that are caused by the operation of overheadvalves. Y r

In my invention, the cylinder is subjected 1 to only such stresses asmay be caused by the compression of the valve spring, and not to thesudden acute pressures caused by the acceleration of the valve-operatingmechanism. I accomplish this object either by rigidly supporting thefulcrum of the valveoperating lever from the crank-case, or bysustaining the thrust on the fulcrum of the valve-operating lever by anon-rigid ten-' sion member. ,In thedrawings afiixed to this specification and forming part thereof, two modifications of an internalcombustion engine embodying my invention are illustrated by way ofexample. In said drawings, i Figs. 1 and 2 are respectively an elevationpartly in section, and a plan, of the one modification, While i Fig; 3is a vertical section of the other modification. Y Referring to Figs.

the operation of the land 2 rigid iconnection' w it e 1 1 tabllshed andthe cylinders themselves are ings, the staybolts aer th e 2/ whichextend right through fiomtop to bottom, are extended upwardly 'to*receive tubular supports b' ot light mt'alsuehss aluminum which are"preferably unitedih pails for instance by suitable" Webs jareblipptlover the said bolts.

oi the axles between the crossbeairis '0 is effetedby, means- 05E thenuts e which use fix the axles upon the, upon the crank-case 6 thatafi'absolfut'ely crank-case is esentirely relieved. from the stresses-resulting from the actuation of the valves,

In the operation ofFigs. 1 and 2. it Will supports a are ems i be seenthat the cam-shaftso actuate push rods hand these operate the rockinglevers g, which .in turn actuate valves 2'. The rocking levers 9, beingsupported onaxlesd, Which are rigidly held by stay bolts a on the top ofsupports 6, are rigidly connected to and supported uponthe crank case findependently of the cylinders. Consequently, Whatever strains-occur inthe operation of the valve-operating mechanism are taken up by the axlesd vhich" are rigidly connected I to andsupp'o'rted by. the crank case.

In the modification illustrated in Fig; 3, the rocking lever 9 operatingthe valve z is permanently linked at 10 tothe end of the valve stem 2,and is operatively attached to thecam perated rod h at point 3. 1Tl1evalve 71 is normally held closed'by a strong spring 4.; 1

It 'Will be clear that, when the rod it ismoved upwards by the actionofthe camshaft 5 to open "valve 71 against thepressure of spring 4,'thelinkk is subjected to an upward pull as the lever g is'rocked aboutthe point ZWhere the link is attached, Since, therefore, the link is issubjected'only to a pull or tension, it is obvious that it need not berigid butean-be made out. of a light rod,

steel Wire, metallic strip, or the like, having cylinder having a port,a valve controlling It willcbje understood that'in so far as the valve.6 and its' connection With the valvelever g are concerned, theillustration in F 1g. l'is of a diagrammatic nature, the arrangementinwpractice including a, spring for returning the valve to its closedposition, saidspring being locatedand arranged as in Fig. 3 or in anyother'equivalent manner; obviously the valved in Fig. 1 operates'tocontrol a port of the'cylinder in the same Way as illustrated in Fig. 3;

, I claim:

1,111 light-weight internal combustion engines, the combination of acrank case, a

said port, ayalve lever for operating said valve, an axial carry ng saidvalve lever, tubular supports extending upwardly from sa d crank caseand carrying said axial,- and stay bolts extendingfrom said crankcasethroughsaid supports for connectingjthelatter and said axle with eachother and with said crank case independently of said cylinder, wherebythe latter is relieucd of stresses incident to valve. J I V 2, Inlight-Weight internal combustion engines, the combination of a crankcase, a

the actuation of said 'cylinderhaving a port, a valve controlling saidport, a valve lever foroperating said valve, .an axial carrying saidvalve lever,

tubular. supports extending upwardly from.

said crankcase, two-part cross-bars carried by said supportsand.mounting said axle thereon, and stay bolts extending from said crankcasethrough said supports for clamp ing saidcross-bars upon said axles andfor fixing saidsupports upon said crank caseindependently of saidcylinder, whereby the latter is relieved of stresses incident to theactuationof said valve.

3. In an internal combustion engine, a support for valve-operatingmechanism comprising a plurality of tubular members resting on the crankcase of the engine, and

bolts passing through said tubular members and holding saidvalve-operatlng mechanism firmly on top of said tubular membersindependently of the engine cylinder, whereby the cylinder is relievedof allstresses incidentto the actuation of said mechanism.

In testimony whereof I affix my signature.

7. I j FRANZ ou s MiiDLER.

